07-20-2012, 04:00 PM | #1 |
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X3 Diesel- ZF auto redline the engine?
Hi,
A quick question- I've got a 3.0d on order. Is it possible with the ZF gearbox to redline the engine? One of the frustrations I have with my existing non BMW diesel auto is the Auto ECU will not allow me to drop into a gear which would mean high reving the engine. i.e. using engine braking. I find I'm on the brakes a lot more then I would with a manual gearbox. Good for saving the engine, but harder on the brakes. Sometimes I just wish I could drop another gear during deceleration, I'm pushing back on the gear lever, and the gearbox will not drop until the revs drop. |
07-20-2012, 04:23 PM | #2 |
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Hmm, you should be able to gear down when it is safe for the engine. Why would you want to gear down when there is a possibility of over revving the engine?
p.s. brakes are cheaper than transmissions to fix.
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07-20-2012, 04:33 PM | #3 |
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I don't want to over rev the engine, just get towards the red line. My current car will not me get anywhere close to the red line. My engine has never seen above 4000 revs.
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07-20-2012, 05:03 PM | #4 | |
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Quote:
This said, in manual mode, you can still have some fun, either up shifting at the limit and downshifting slightly below the redline. |
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07-20-2012, 05:04 PM | #5 |
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I go along with the "brakes are cheaper than transmissions", particularly with AWD.
But there should be no reason why the 'box won't down change on manual command, if the engine is not going past the redline in doing so. To be honest I never engine brake to that level in my 3-series 330d. Although I do engine brake, when out in the mountains or on snow, (winter tyres of course). HighlandPete |
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07-22-2012, 02:39 AM | #7 |
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Max power is at 4000rpm and a diesel engine works on torque more than power. In sport the transmission will change at the points to give the best acceleration which will be between 3 - 4000 rpm, to rev higher would be slower
The only need to go above 4000 rpm would be for engine breaking down steep hills or when towing. |
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